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http://dx.doi.org/10.9713/kcer.2012.50.2.385

Torrefaction Characteristics of Wood Chip for the Production of High Energy Density Wood Pellet  

Lee, Jae-Won (Department of Forest Products and Technology (BK21 Program), College of Agriculture & Life Sciences, Chonnam National University)
Kim, Young-Hun (Department of Forest Products and Technology (BK21 Program), College of Agriculture & Life Sciences, Chonnam National University)
Lee, Soo-Min (Division of Bioenergy, Department of Forest Resources Utilization, Korea Forest Research Institute)
Lee, Hyoung-Woo (Department of Forest Products and Technology (BK21 Program), College of Agriculture & Life Sciences, Chonnam National University)
Publication Information
Korean Chemical Engineering Research / v.50, no.2, 2012 , pp. 385-389 More about this Journal
Abstract
In this study, torrefaction of mixed softwood chips under anoxic condition was performed to improve energy density and maintain consistent quality of biomass. Characteristics of torrefied biomass depending on reaction time (30 min) and temperature (240, 260,$280^{\circ}C$) were investigated. Torrefaction of mixed softwood chips significantly improved the heating value compared to that of untreated biomass. As the torrefaction temperature was increased, the carbon content of torrefied biomass increased from 46.55 to 55.73%, while its hydrogen and oxygen contents decreased from 6.00 to 5.87% and from 30.55 to 27.21%, respectively. Most of hemicelluloses and volatile compounds were removed during torrefaction. The highest heating value was 5132 kcal/kg when torrefaction was performed at$280^{\circ}C$ for 30 min. It implied that the heating value increased by 13% compared to that of original biomass. However, the condition of effective torrefaction was at $240^{\circ}C$ for 30 min when weight loss and energy yield was considered.
Keywords
Torrefaction; Energy Density; Heating Value; Energy Yield;
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